AirHint found the following cheapest return flights from Calgary (YYC) to Lisbon (LIS) in September 2026 (see full year).

Return flights

28 Sep - 19 Oct	WestJet
02 Sep - 21 Sep	Porter Airlines (Canada) Ltd
05 Sep - 15 Sep	Air Transat
02 Sep - 15 Sep	Porter Airlines (Canada) Ltd
05 Sep - 29 Sep	Air Transat
02 Sep - 24 Sep	Air Transat
05 Sep - 28 Sep	Air Transat
02 Sep - 17 Sep	Air Transat
20 Sep - 29 Sep	Air Transat
01 Sep - 08 Sep	Air Transat
01 Sep - 14 Oct	Air Transat
29 Sep - 07 Oct	Air Transat
02 Sep - 10 Sep	Air Transat
02 Sep - 14 Oct	Air Transat
25 Sep - 12 Oct	Air Transat
14 Sep - 04 Oct	Air Transat

Also check the deals for one-way flights from Calgary to Lisbon in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Calgary to Lisbon in September from 423€

Return flights